Inherent instability investigation for low speed laser welding of aluminum using a single-mode fiber laser

Paleocrassas, A. G.; Tu, Jay F.

doi:10.1016/j.jmatprotec.2010.04.002

Cited by 29 publications

(18 citation statements)

References 17 publications

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“…6. The low boiling point elements, high thermal conductivity and low viscosity are some of the reasons that make the keyhole laser welding of aluminium an unstable process causing also porosity and blow holes [23], which matches with Fig. 7b, i, respectively.…”

Section: Effect Of Interaction Time and Power Factorsupporting

confidence: 74%

Fundamental understanding of the interaction of continuous wave laser with aluminium

Coroado

Meco

Williams

et al. 2017

Int J Adv Manuf Technol

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In welding, the depth of penetration, weld profile and the corresponding thermal cycle are the three basic outcomes that a user wishes to control flexibly. In laser welding applications, controlled application of power and energy density is the key to achieve predictable control of these characteristics. Creation of an analytical model is an important step towards understanding the underpinning science of laser metal interaction in controlling the depth, bead geometry and thereby temperature profile of a weld. The "power factor model", which correlates the power applied per unit length to the laser metal interaction time, has been originally developed and validated for mild steel, guides a user on the selection laser system parameters, to achieve specific weld profile. This study is performed to extend the power factor-interaction time model to aluminium alloys by understanding the underpinning laser aluminium interaction parameters in terms of power density, interaction time, specific point energy and their correlation with the weld bead profiles. Although the power factor and interaction time showed a rectangular hyperbolic relationship, as observed in low carbon steel, for a specific weld depth and profile, the absolute magnitude and the characteristic profile of the curve is different due to the intrinsic differences in physical and thermal properties of aluminium as compared to steel. It was shown that identical depth of penetration but different weld metal profile can be obtained for a specific beam diameter for a range of power and travel speed by keeping the energy input per unit length constant.

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Section: Effect Of Interaction Time and Power Factorsupporting

confidence: 74%

Fundamental understanding of the interaction of continuous wave laser with aluminium

Coroado

Meco

Williams

et al. 2017

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…Fiber laser welding, as an emerging welding method, has been received attention in the recent ten years compared to CO 2 and Nd:YAG laser welding. The fiber laser with a maximum output power of 5-10 kW and even up to 50 kW was developed [10,11]. Due to high-power, high-beam quality and high-welding speeds, the fiber laser can product narrow and deep penetration welds of the thick metal sheet [12].…”

Section: Introductionmentioning

confidence: 99%

Residual stress, micro-hardness and tensile properties of ANSI 304 stainless steel thick sheet by fiber laser welding

Zhang

Luo

et al. 2013

Materials Science and Engineering: A

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“…At slower welding speeds, the welding process can become unstable, leading to inefficient energy coupling, shallow welds, irregular weld width, and large porosities (Paleocrassas and Tu, 2010).…”

Section: Challenges In Aluminum Crack Fusion By Laser Weldingmentioning

confidence: 99%

“…1, we see that for the speeds of 2, 4 and 10 mm/s the average efficiency (percentage of input power absorbed by the weld or conducted away) of the process was approximately 90% of the input power (315 W). Note that even though aluminum is highly reflective, the laser beam absorption can be very high if a stable keyhole is established (Paleocrassas and Tu, 2010). Below 2 mm/s there is a significant decrease in penetration and absorbed power making those speeds unsuitable for laser crack repair.…”

Section: A Model For Low-speed Thick-sheet Partial Penetration Lasementioning

confidence: 99%

Inherent instability investigation for low speed laser welding of aluminum using a single-mode fiber laser

Cited by 29 publications

References 17 publications

Fundamental understanding of the interaction of continuous wave laser with aluminium

Fundamental understanding of the interaction of continuous wave laser with aluminium

Residual stress, micro-hardness and tensile properties of ANSI 304 stainless steel thick sheet by fiber laser welding

Fatigue crack fusion in thin-sheet aluminum alloys AA7075-T6 using low-speed fiber laser welding

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